7. The unit of strain is: A. Pascal C. Dimension-less B. Meters D. Newton B 8. A wire is stretched 3 mm by a force of 150 N. Assuming the elastic limit is not exces force that will stretch the wire 5 mm is: B. 250 N A. 150 N C. 90 N D. 450 N 9. A circular rod of cross-sectional area 100 mm 2 has a tensile force of 100 kN applic The stress in the rod is: A. 1 MPa B. 1 GPa C. 1 kPa 10. When too many people stand on a bridge it collapses, why? A. Due to increase in stress D. 100 MPa D. Due to friction B. Due to overweight C. Due to improper construction 11. A copper wire of length 3m and 1mm diameter is subjected to a tension of 5N. C elongation produced, if the young's modulus of copper is 120GPa. B. 1800m C. 0.125 x10 m A. 15m D. 15.9 m
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